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1、HowClucthesWorkIfyoudriveamanualtransmissioncar,youmaybesurprisedtofindoutthatithasmorethanoneclutch.Anditturnsoutthatfolkswithautomatictransmissioncarshaveclutches,too.Infact,thereareclutchesinmanythingsyouprobablyseeoruseeveryday:Manycordlessdrillshaveaclutch,chainsawsha
2、veacentrifugalclutchandevensomeyo-yoshaveaclutch.ClutchIma^eGalleryQEngineQClutchQClutchPedalQManualTransmission©?OOQHgSrurtVXnrkRDiagramofcarshowingclutchlocation.Seemoreclutchimages.Inthisarticle,you'lllearnwhyyouneedaclutch,howtheclutchinyourcarworksandfindoutsomeintere
3、sting,andperhapssurprising,placeswhereclutchescanbefound.Clutchesareusefulindevicesthathavetworotatingshafts.Inthesedevices,oneoftheshaftsistypicallydrivenbyamotororpulley,andtheothershaftdrivesanotherdevice.Inadrill,forinstance,oneshaftisdrivenbyamotorandtheotherdrivesadr
4、illchuck.Theclutchconnectsthetwoshaftssothattheycaneitherbelockedtogetherandspinatthesamespeed,orbedecoupledandspinatdifferentspeeds.Inacar,youneedaclutchbecausetheenginespinsallthetime,butthecar'swheelsdonot.Inorderforacartostopwithoutkillingtheengine,thewheelsneedtobedis
5、connectedfromtheenginesomehow.Theclutchallowsustosmoothlyengageaspinningenginetoanon-spinningtransmissionbycontrollingtheslippagebetweenthem.Tounderstandhowaclutchworks,ithelpstoknowalittlebitaboutfriction,whichisameasureofhowharditistoslideoneobjectoveranother.Frictionisc
6、ausedbythepeaksandvalleysthatarepartofeverysurfaceevenverysmoothsurfacesstillhavemicroscopicpeaksandvalleys.Thelargerthesepeaksandvalleysare,theharderitistoslidetheobject.YoucanlearnmoreaboutfrictioninHowBrakesWork.Aclutchworksbecauseoffrictionbetweenaclutchplateandaflywhe
7、el.We'lllookathowthesepartsworktogetherinthenextsection.FlyWheels,ClutchPlatesandFrictionInacar'sclutch,aflywheelconnectstotheengine,andaclutchplateconnectstothetransmission.Youcanseewhatthislookslikeinthefigurebelow.Whenyourfootisoffthepedal,thespringspushthepressureplate
8、againsttheclutchdisc,whichinturnpressesagainsttheflywheel.Thislockstheenginetothetransmis
